gomp-20050608-branch/libjava/classpath/javax/management/Attribute.java

   1 /* Attribute.java --
   2    Copyright (C) 2006 Free Software Foundation, Inc.
   3
   4 This file is part of GNU Classpath.
   5
   6 GNU Classpath is free software; you can redistribute it and/or modify
   7 it under the terms of the GNU General Public License as published by
   8 the Free Software Foundation; either version 2, or (at your option)
   9 any later version.
  10
  11 GNU Classpath is distributed in the hope that it will be useful, but
  12 WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14 General Public License for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with GNU Classpath; see the file COPYING.  If not, write to the
  18 Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  19 02110-1301 USA.
  20
  21 Linking this library statically or dynamically with other modules is
  22 making a combined work based on this library.  Thus, the terms and
  23 conditions of the GNU General Public License cover the whole
  24 combination.
  25
  26 As a special exception, the copyright holders of this library give you
  27 permission to link this library with independent modules to produce an
  28 executable, regardless of the license terms of these independent
  29 modules, and to copy and distribute the resulting executable under
  30 terms of your choice, provided that you also meet, for each linked
  31 independent module, the terms and conditions of the license of that
  32 module.  An independent module is a module which is not derived from
  33 or based on this library.  If you modify this library, you may extend
  34 this exception to your version of the library, but you are not
  35 obligated to do so.  If you do not wish to do so, delete this
  36 exception statement from your version. */
  37
  38 package javax.management;
  39
  40 import java.io.Serializable;
  41
  42 /**
  43  * Represents an MBean attribute, having the name and the assigned value. The
  44  * MBean objects use this class to get and set attributes values.
  45  *
  46  * @since 1.5
  47  *
  48  * @author Audrius Meskauskas, Lithuania (AudriusA@Bioinformatics.org)
  49  */
  50 public class Attribute
  51   implements Serializable
  52 {
  53   /**
  54    * The attribute name.
  55    */
  56   final String m_name;
  57
  58   /**
  59    * The attribute value.
  60    */
  61   final Object m_value;
  62
  63   /**
  64    * Create the attribute with the given name and value.
  65    *
  66    * @param name the attribute name
  67    * @param value the attribute value
  68    */
  69   public Attribute(String name, Object value)
  70   {
  71     m_name = name;
  72     m_value = value;
  73   }
  74
  75   /**
  76    * Compares the attribute with another attribute.
  77    *
  78    * @param other the other object to compare with
  79    *
  80    * @return true if both value and object are equal, false otherwise.
  81    */
  82   public boolean equals(Object other)
  83   {
  84     if (other instanceof Attribute)
  85       {
  86         Attribute oa = (Attribute) other;
  87         boolean n, v;
  88         if (oa.m_name == null || m_name == null)
  89           n = oa.m_name == m_name;
  90         else
  91           n = oa.m_name.equals(m_name);
  92
  93         if (oa.m_value == null || m_value == null)
  94           v = oa.m_value == m_value;
  95         else
  96           v = oa.m_value.equals(m_value);
  97
  98         return n && v;
  99
 100       }
 101     else
 102       return false;
 103   }
 104
 105   /**
 106    * Returns the attribute name.
 107    *
 108    * @return the attribute name
 109    */
 110   public String getName()
 111   {
 112     return m_name;
 113   }
 114
 115   /**
 116    * Returns the attribute value.
 117    *
 118    * @return the attribute value.
 119    */
 120   public Object getValue()
 121   {
 122     return m_value;
 123   }
 124
 125   /**
 126    * Need to override as {@link #equals} is overridden.
 127    *
 128    * @return the expression, dependent of the object and name hashcodes.
 129    */
 130   public int hashCode()
 131   {
 132     int n = m_name == null ? 0 : m_name.hashCode();
 133     int v = m_value == null ? 0 : m_value.hashCode();
 134
 135     return n ^ v;
 136   }
 137
 138 }